How to Convert Heater Hose to -10AN

 Autoplumb offers the following methods to convert your existing Heater Core Tubes to AN. All the items needed are available from the menu on this page. Add Quantity in Cart. A. To convert from existing Heater Core Tubes that exit the Firewall 1. If you are converting your existing Barbed Heater Core Tubes exiting the Firewall use our "Barb to AN Adapters". Accurately measure the tubes ( not the barb) Select from the menu either (3/4" to -10AN) or (5/8" to -10AN) depending on the OD of your existing tubes. 2. To connect to the Manifold, Water Pump, Etc. of most Chevy and Ford engines select from the menu the appropriate NPT to -10AN Adapters. It is recommended to use a straight NPT to AN Adapter then attach your hose using your preferred angle -10AN Hose end. 3. Two methods can be used to convert the Hose Barbs of a LS pump to AN. Method 1: Using our Barb to AN Adapters a) Determine the correct tube size. (Most LS pumps have one 5/8" and one 3/4" barbed tube)  b) Select from the menu 1